Means for preventing condensation of moisture in transformer-tanks.



F. C. ,GRBEN. MEANS PREVENTING GONDBNSATION MOISTURE IN TRANSFORMER TANKS.

' :AifPLIOATIOH IILED NOV. 12, 1913.

1,108,746 4 Patented Augz25, 1914 llllllfllllilllillllll W7 TZVE'SSES IN vim! fan I M .Fhzrzvx: C. GREEN,

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l'ittsfield, county of Berkshire, State' of' UNITED STATES PATENT OFFICE.

FBANK C. GKEEN,OF PITTSFIELD, MASSACHUSETIS, ASSIGNOR TQ GENERAL ELECTRIC COMPANY, A CORPORATION OF'NEW YORK;

MEANS FOR PREVENTING CONDENSATION OF MOISTURE IN TRANSFOBMEE-T ANKS.

TbaIZw/wm it may concern:

lie itknown that I, FRANK. C. (Essen, a citizen of the United States, residing at lilassachusetts, have inventedv certain new and useful Improvements in Means for Preleft above the routing Condensation of Moisture in Transformer-Tanks, of which the following is a specification. 1

Normally the liuid in which a power transformer is submerged does not quite fi-ll the containin tank and an airspace is uid. The heating of the transformer as it assumes itsload or as its load increases, tends to expand the insulating fluid andtheair above it, and conversely both tend to contract as they lose their heat as the load decreases. The simplest way to take care of this expansion and providing air drying means in the open connection between the interior of the tank and the atmosphere, butsuch driers are not entirely satisfactory and do not entirely perform their functions, principally ornaccount of lack of attention by theattendants. Now, I" propose to prevent the'oondensation with in' the tank of any moisture which may I enter. The usual airdrier may or may not be used. I do this by providing a heating unit within the air space above the insulat ing fluid so proportioned that the tempera ture of theair Within thisspaCe and, if necessary, (if the surrounding materials, is maintained-at sucha point as, to render the condensation of moisture impossible,

in the a companying drawing which forms a. past of this specification, the single 0 a figure is anelevation partly in section transformer and case provided with my invention Specification of Letters Patent.

Application filed November I2, 1913. Serial No. 800,540.

Patented Aug. 25, 1914.

The transformer tank l is of theusual construction. It is provided with the cover Vv'ithin the tank is the insulating fluid 3 in which is submerged the trans its exact construction forms no part of this inrention. I consider it preferable to locate this heating unit above the surface of the insulating fluid 3. I

The heating unit (5 may receive energy at all times while the fluid 3 is within the tank. It may frequently be sufficient, however, for

this heating unit to be in service only while the transformer-'4 is carrying a low degree of load or'is entirely out of service, for' generally-the heat developed in the transformer itself will be sufiicient to maintain the temperature of the air and the surrounding materials at such a'degree as to prevent the condensation of moisture. i

What I claim new and desire to secure by Letters Patent of the United States, is 2'"? 1. The combination with a transformer tank, an insulating fluid partly fillingsaid tank, the space above the fluid communicating with the atmosphere, and a transformer submerged in said. fluid, of an electric heating device in the space between thesurface of the fiuid and thetop of the tank.

The coml'iination with avtransformer tank, an insulating fluid partly fillingsaid tank, the space above the fluid conunu'nicating with the atniosphere, and a transformer submerged in said fluid, of an electric heating device attached tothe cover of the tank above thesurface of the insulating fluid.

In witness whereof, I havehereunto set my hand this 5th day of November, 1913. FRANK C. GREEN. itnessesz A. S. Gmsoow, U. B. JOHNSON. 

